Add prometheus data source

Change-Id: Ia56aa4e8015eacf8e21f78d3aba7f9822515b364

grafana_dashboards/schema/datasource.py

@@ -23,7 +23,8 @@ class Datasource(object):
             v.Required('isDefault', default=False): v.All(bool),
             v.Required('name'): v.All(str, v.Length(min=1)),
             v.Required('type', default='graphite'): v.Any('graphite',
-                                                          'influxdb'),
+                                                          'influxdb',
+                                                          'prometheus'),
             v.Required('url'): v.All(str, v.Length(min=1)),
             v.Optional('orgId'): int,
             v.Optional('database'): v.All(str, v.Length(min=1)),

tests/schema/fixtures/datasource-0003.json

@@ -0,0 +1,11 @@
+{
+    "datasource": {
+        "new-prometheus-datasource": {
+            "access": "proxy",
+            "isDefault": false,
+            "name": "New prometheus datasource",
+            "type": "prometheus",
+            "url": "http://example.org:9090"
+        }
+    }
+}

tests/schema/fixtures/datasource-0003.yaml

@@ -0,0 +1,5 @@
+datasource:
+  name: New prometheus datasource
+  url: http://example.org:9090
+  access: proxy
+  type: prometheus